Question detail
Explain why a lighted splint is used to confirm the presence of hydrogen gas in an acid–metal reaction.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Reactions of acids
Question
Explain why a lighted splint is used to confirm the presence of hydrogen gas in an acid–metal reaction.
Answer
A lighted splint is used because hydrogen gas is colourless and odorless, so it cannot be seen or smelled. When the gas comes into contact with the flame of the splint it reacts to form water, giving a distinct popping sound that indicates the presence of hydrogen.
Explanation
The answer shows understanding of the properties of hydrogen gas and the reason the popping sound is a reliable indicator, testing the student’s grasp of the concept behind the test.
Common mistake
Hydrogen Test Confusion
Students often state that hydrogen gas can be identified by its color or smell.
Emphasize that hydrogen gas is colorless and odorless, and the test involves using a lighted splint to produce a 'pop' sound.
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